“A similar system was built in London. Their deadline was in the form of the Olympics. So they were able to construct their system in less than two years,” Levy said.

The Skyway from Williamsburg to the Lower East Side can carry roughly 200,000 passengers a day — slightly less than the subway.

“Roughly 5,000 people per hour and get them across the river in less than five minutes,” Levy said.

Engineers estimate the cost at $134 million. Levy said it would be paid for by private investors.

The L Train runs beneath 14th Street in Manhattan and connects to Williamsburg, Brooklyn, and several other Brooklyn communities going east to Canarsie.

With 225,000 daily riders, the L is critical to straphangers from Bushwick and Williamsburg where the commutes are already crowded.

The Metropolitan Transportation Authority is expected to begin massive repairs to the Superstorm Sandy-damaged Canarsie Tunnel in 2019, but the agency has yet to decide whether or not the line will be shut down completely or just during weekends.